期刊
ADVANCED MATERIALS
卷 30, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705913
关键词
carbon dots; multiphoton-induced fluorescence; near-infrared absorption; near-infrared fluorescence; surface engineering
类别
资金
- National Natural Science Foundation of China [51602304]
- Jilin Province Science and Technology [20170101191JC, 20170101042JC, 20160520008JH, 20150519003JH]
- Youth Innovation Promotion Association of Chinese Academy of Sciences
- Open Project Program of the State Key Laboratory of Supramolecular Structure and Materials in Jilin University [sklssm201712]
- Ministry of Science and Technology of China [2012CB933002]
- Open Project Program of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB07030100]
- Nanomaterials and Nanotechnologies for Environment Protection and Sustainable Future (NanoEnviCz) [LM2015073]
- Ministry of Education, Youth and Sports of the Czech Republic [LO1305]
Carbon dots (CDs) have significant potential for use in various fields including biomedicine, bioimaging, and optoelectronics. However, inefficient excitation and emission of CDs in both near-infrared (NIR-I and NIR-II) windows remains an issue. Solving this problem would yield significant improvement in the tissue-penetration depth for in vivo bioimaging with CDs. Here, an NIR absorption band and enhanced NIR fluorescence are both realized through the surface engineering of CDs, exploiting electron-acceptor groups, namely molecules or polymers rich in sulfoxide/carbonyl groups. These groups, which are bound to the outer layers and the edges of the CDs, influence the optical bandgap and promote electron transitions under NIR excitation. NIR-imaging information encryption and in vivo NIR fluorescence imaging of the stomach of a living mouse using CDs modified with poly(vinylpyrrolidone) in aqueous solution are demonstrated. In addition, excitation by a 1400 nm femtosecond laser yields simultaneous two-photon-induced NIR emission and three-photon-induced red emission of CDs in dimethyl sulfoxide. This study represents the realization of both NIR-I excitation and emission as well as two-photon-and three-photon-induced fluorescence of CDs excited in an NIR-II window, and provides a rational design approach for construction and clinical applications of CD-based NIR imaging agents.
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